Mechanism of hole propagation in the orbital compass models

2014
journal article
article
cris.lastimport.scopus2024-04-25T20:53:16Z
dc.abstract.enWe explore the propagation of a single hole in the quantum compass model, whose nematic ground state is given by mutually decoupled antiferromagnetic chains. The compass model can be seen as the strong-coupling limit of a spinless two-band Hubbard model, which we study here using mean-field theory and the variational cluster approach. Due to the symmetries of the compass model, the inherent disorder along one lattice direction turns out not to affect hole motion, and doping a hole consequently does not lift the subextensive degeneracy of the nematic phase. To broaden and deepen understanding, we derive a generalized itinerant model and address the transition to two-dimensional Ising order. We observe coherent hole motion in both the nematic and the antiferromagnetic phases, also in the presence of quantum fluctuations away from pure Ising exchange. In addition to quantum fluctuations and interorbital hopping, three-site hopping is found to play an important role and to dominate propagation in the two-dimensional Ising limit as well as along the antiferromagnetic chains in the nematic order which forms in the compass model.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiegopl
dc.contributor.authorBrzezicki, Wojciech - 114048 pl
dc.contributor.authorDaghofer, Mariapl
dc.contributor.authorOleś, Andrzej - 100024 pl
dc.date.accessioned2015-03-11T10:49:49Z
dc.date.available2015-03-11T10:49:49Z
dc.date.issued2014pl
dc.description.number2pl
dc.description.publication1pl
dc.description.volume89pl
dc.identifier.articleid024417pl
dc.identifier.doi10.1103/PhysRevB.89.024417pl
dc.identifier.eissn1550-235Xpl
dc.identifier.eissn1538-4489pl
dc.identifier.issn1098-0121pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/3702
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licencebez licencji
dc.rights.uri*
dc.subtypeArticlepl
dc.titleMechanism of hole propagation in the orbital compass modelspl
dc.title.journalPhysical Review. B, Condensed Matter and Materials Physicspl
dc.typeJournalArticlepl
dspace.entity.typePublication
cris.lastimport.scopus
2024-04-25T20:53:16Z
dc.abstract.enpl
We explore the propagation of a single hole in the quantum compass model, whose nematic ground state is given by mutually decoupled antiferromagnetic chains. The compass model can be seen as the strong-coupling limit of a spinless two-band Hubbard model, which we study here using mean-field theory and the variational cluster approach. Due to the symmetries of the compass model, the inherent disorder along one lattice direction turns out not to affect hole motion, and doping a hole consequently does not lift the subextensive degeneracy of the nematic phase. To broaden and deepen understanding, we derive a generalized itinerant model and address the transition to two-dimensional Ising order. We observe coherent hole motion in both the nematic and the antiferromagnetic phases, also in the presence of quantum fluctuations away from pure Ising exchange. In addition to quantum fluctuations and interorbital hopping, three-site hopping is found to play an important role and to dominate propagation in the two-dimensional Ising limit as well as along the antiferromagnetic chains in the nematic order which forms in the compass model.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
dc.contributor.authorpl
Brzezicki, Wojciech - 114048
dc.contributor.authorpl
Daghofer, Maria
dc.contributor.authorpl
Oleś, Andrzej - 100024
dc.date.accessioned
2015-03-11T10:49:49Z
dc.date.available
2015-03-11T10:49:49Z
dc.date.issuedpl
2014
dc.description.numberpl
2
dc.description.publicationpl
1
dc.description.volumepl
89
dc.identifier.articleidpl
024417
dc.identifier.doipl
10.1103/PhysRevB.89.024417
dc.identifier.eissnpl
1550-235X
dc.identifier.eissnpl
1538-4489
dc.identifier.issnpl
1098-0121
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/3702
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
bez licencji
dc.rights.uri*
dc.subtypepl
Article
dc.titlepl
Mechanism of hole propagation in the orbital compass models
dc.title.journalpl
Physical Review. B, Condensed Matter and Materials Physics
dc.typepl
JournalArticle
dspace.entity.type
Publication
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